i wrote a blog and explained everything about players league you can see here:
https://www.chess.com/blog/Kachigaru/what-are-chess-com-leagues
also you can checʞ main league page to get information: https://www.chess.com/leagues
The Blog was very helpful!
I am on 1st rank in my division of stone league. Division: Si6DBAzz2. So is it a huge success or just a small thing. And also can anyone please explain me how this player's league works?